<template>
    <div class="app-header-sticky" :class="{show: y > 78}">
      <div class="container">
        <router-link class="logo" to="/" />
        <app-header-nav />
        <div class="right">
          <router-link to="/">品牌</router-link>
          <router-link to="/">专题</router-link>
        </div>
      </div>
    </div>
  </template>

<script>
import AppHeaderNav from './AppHeaderNav.vue'
// import { ref, onMounted, onUnmounted } from 'vue'
import { useWindowScroll } from '@vueuse/core'
export default {
  name: 'AppHeaderSticky',
  components: { AppHeaderNav },
  setup () {
    // const y = ref(0) // 页面滚动
    // // 复用变量
    // const windowFn = () => {
    //   y.value = document.documentElement.scrollTop
    // }
    // // 绑定window滚动事件
    // onMounted(() => {
    //   window.addEventListener('scroll', windowFn)
    // })
    // // 销毁方法
    // onUnmounted(() => {
    //   window.removeEventListener('scroll', windowFn)
    // })
    const { y } = useWindowScroll()
    return {
      y
    }
  }

}
</script>

  <style scoped lang='less'>
  .app-header-sticky {
    width: 100%;
    height: 80px;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 999;
    background-color: #fff;
    border-bottom: 1px solid #e4e4e4;
    .container {
      display: flex;
      align-items: center;
    }
    .logo {
      width: 200px;
      height: 80px;
      background: url(../assets/logo.png) no-repeat right 2px;
      background-size: 160px auto;
    }
    .right {
      width: 220px;
      display: flex;
      text-align: center;
      padding-left: 40px;
      border-left: 2px solid var(--xtx-color);
      a {
        width: 38px;
        margin-right: 40px;
        font-size: 16px;
        line-height: 1;
        &:hover {
          color: var(--xtx-color);
        }
      }
    }
    transform: translateY(-100%);
    opacity: 0;
    &.show {
      transition: all 0.3s linear;
      transform: none;
      opacity: 1;
    }
  }
  </style>
